δεν καταλαβαίνω γιατί τόσο πρόβλημα ο τοροειδής και το ρεύμα εκκίνησης, σε τόσα και τόσα hifi ενισχυτικά μηχανήματα που έχουν τοροειδή τι λύση βρίσκουν; ???
ψάχνοντας στο δίκτυο μόλις διάβασα αυτό το σχετικό κείμενο
In-Rush Currents
A consequence of the superior magnetic properties of a toroidal transformer is that the transformer "remembers" what polarity the primary voltage had immediately before the power was last shut off. Whenever the voltage has the same polarity when the transformer next is turned on, the core will saturate for part of a half-cycle, and a high in-rush current will flow in the primary of the transformer. This in-rush current is larger than the in-rush current in a conventional transformer, but it is of very short duration, so it will not affect slow-blow fuses or magnetic overload protectors with thermal delay characteristic. (Some delayed magnetic overload protectors act instantly if the current exceeds a certain value. These cannot be used with large toroidal transformers unless a current limiting resistor is used as described below.)
For very large transformers (1,500VA and up),it is common to use a small current-limiting primary resistor to reduce the magnitude of the in-rush current, and a delayed by-pass relay to short out the resistor after 30-200 milli-seconds. This method eliminates external voltage dips caused by the in-rush current, but slow-blow fuses or delayed magnetic overload protectors must still be used, as is the case for all types of transformers.